4.4 Given the expression for the area of a circle, A = r, and using only uniformly distributed random variates, devise a sampling approach for computing . 4.5 Rearrange the logistic function 1 = P(Tnew 1|xnew, w) 1+exp(-xnew) to show that P(Tnew = 1|xnew, ) = 0.5 implies xnew = 0.